Type-writing machine.



.F A. YOUNG. TYPE'WRITING MACHINE.

APPLICATION FILED 00119, I l910 Patented Feb. 27, 1912.

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Witnesses to clutch the latter to the platen.

UNITED STATES PATENT orr on.

FRANK A. YOUNG, OF NEW YORK; N. Y.,' ASSIG-NOR TO UNDERWOOD TYPEWRITERCOMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPE-WRITIN G MACHINE.

Specification. of Letters Patent.

Application filed October 19, 1910. Serial No. 587,854.

new and useful Improvements in Type Vriting Machines, of which thefollowing is a specification.

This invention relates to means for releasing platens from control bythe linespace wheels of typewriting machines, and is in the nature of animprovement on the structure disclosed in U. S. Letters Patent No.581,717, issued to G. V. Hall, May 4, 1897, in which the platen isreleasable from the line-space wheel. Pressure against a sliding rodwedges the outer ends of a pair of toggle links against the line-spacewheel An opposite movement of the rod releases .the clutch.

The principal object of this invention is to simplify and improve thedevices with a view to rendering the construction compact and reliable,easily operated and inexpensiveto manufacture.

In place of a toggle, I employ'an axially slidable head having a seriesof clutching dogs pivoted thereto, to grip the inner periphery of thedrum of the line-space wheel.

and connect itito the platen.

Other features and advantages will hereinafter appear.

In the accompanying drawings, Figure 1 is a perspective rear view,showing the in vention applied to an Underwood machine. Fig. 2 is a rearsectional elevation, the platen being clutched to the line space wheel.Fig. 3' shows the platen released.

Fig. at is an end view, partly in section." Fig. 5 is aperspective'showing the parts disassembled and partly broken away.

Types 1 strike a platen 2 fast on an axle 3 journaled in the ends 4 of aplaten frame. A line-space wheel 5, having a drum 6, is loosely mountedon a barrel in the form of an annular flange 7 on a disk 8 fast to theaxle, and is turned in the'usual manner. The wheel is held againstlateral displacement by a guard 9. The usual detent 10 engages thewheel.

The platen is clutched to the line-space wheel by three equidistantradially-extending dogs 14: hinged at 15 to a head or carrier 17 withinthe barrel 7; said dogs (of which a greater or less number than threemay be employed) projecting through slots Patented Feb. 27, 1912. v

16 in the barrel to bite the inner periphery of the drum 6oft-he'line-space wheel. The

dogs'let .fit snugly between the walls of the slots 16, to preventrelative turning movement' between the line-space wheel and platenwhenclutched together. They are pivoted in ears 18 projectlng from thehead 17, connected to rotate with, the platen.

These dogs 14 operate soinewhat'like toggles, the length of each dogbeing slightly greater than the distance between the inner periphery ofthe drum 6 and the pivot 15. The drum preferably has an interior annular.groove 21, which maybe substantially V-shaped in cross-section, inwhich the ends of the dogs 14 are confined, said dogs biting upon theopposite side walls of said groove to afford a powerful grip. Afinger-piece 19 is provided upon the outer end of a sliding hollowplunger or stem 20, the latter connected to the head 17. \Vhen saidplunger is pressed to the leftat Fig.2, it forces the head 17 to slidein axial direction to rock the dogs and relieve the pressure vof theirouter ends upon the drum 6 to enable the platen 2 to be freely turned.

The inner end of the hollow plunger or stem 20 which is supported on theaxle 3, is cupped at 27 to slide over the hub 28 of the fixed disk 8. Areturning spring 22 on the hub bears against the inner end of saidplunger to return the head 17 to normal position,

' thereby causing the dogs 14 to bite the linespace wheel. The usualfinger knob 23 to turn the platen 2 is fixed on a hub 24 which mayencircle the plunger 20. Opposite setscrews 25, passing through radialslots 26 in the plunger 24, and engaging a groove or depression 25 inthe axle, secure the knob 23 to the axle, and enable the knob to turnthe axle and platen. Saidscrews 25 also operate to spline the plunger tothe axle, and permit axial movement of the plunger to release the dogs.

By beveling the free ends of the dogs 14: (see Fig. 4) a comparativelyslight pressure of the spring causes a strong bite. The strength of thebite isaugmented by the sloping or converging sides of the groove,between which the dogs operate like wedges, causing great pressureandfriction; the tips of the dogs being rounded or out 01f so that they donot touch the'bottom of the groove.

Also a rigid clutch connection may be obtainedbetween the platen andline-space wheel by connecting the dogs with the bar rel 7 at pointsadjacent the bite of the dogs and wheel, as shown.

' Having thus described my invention, I claim:

1. In a typewriting machine, the combination with a line-space wheel anda platen,

said wheel having a V-shaped groove, of a slottedbarrel fast with theplaten and on which the wheel is loosely mounted, and a clutch headwithin the barrel and having dogs projecting through slots in thebarrel.

to wedge between the walls of said V-shaped groove.

2. In a typewriting machine, the combination with a line-space wheel anda platen, said wheel having a V-shaped groove, of a slotted barrel fastwith the platen and on which the wheel is loosely mounted, a clutch headwithin the barrel and having dogs projecting through slots in the barrelto wedge between the walls of said V-shaped groove, and a finger pieceto control the head. and dogs.

3. In a typewriting machine, the combination with a line-space wheel,and a platen and axle rotatable relatively thereto, of a slotted barrelfast on the axle, a line-space wheel having a drumloosely mounted on thebarrel, an axially slidable head, clutch dogs pivoted on the head andextending through the slots int-he barrel, said drum having a groove,the walls ot which are. engaged by the dogs, and a finger piececontrolling the 1 head.

v and axle adapted to turn relatively thereto,

of an axially movable head having a slotted plunger supported on theaxle, a turning.

knob. through which the plunger extends, a pin passing through the slotin the plunger to secure the knob to the axle and to spline the plungerto the axle, and a dog on the j head to bite the line-space wheel.

6. In a typewriting machine, the combination with a platen and axle, anda line-space Wheel having a drum mounted loosel relatively thereto, andprovided with a V-shaped groove, of a spring-pressed head axiallyslidable within the drum and turning with the axle, radially-extendingdogs pivoted on the head and of greater length than the distance betweenthe inner periphery of the drum and the pivotal points of said dogs, to

wedge in the groove of said drum, and a finger piece to control thehead.

7 In a typewriting machine, the combina tion wit-ha. platen and itsaxle, :of a linespace wheel having a grooved drum relatively to whichthe platen and axle are retatable, an axially slidable head turning withthe axle, dogs pivoted on the head, the free ends of the dogsaccommodated in the groove to bite the drum, and a finger piece torelease the dogs. a i I 8. In a typewriting machine, the combinationwith a platen and axle, of a linespace wheel having a drum provided witha V.-shapedgroove, loosely mounted relatively to the platen and axle, adog connected -to turn with the platen, the free'end of theidog confinedin said groove to wedge between the walls thereof to lock the platen andwheel together.

9. In a typewrlting machine, the combina tion with a platen and-axle, abarrel fixed thereto, 1 and a line-spaced wheel loosely mounted on thebarrel, of a clutch comprising an axially slidable head, dogs hingedtothe head to bite the line-spaced wheel, said dogs passing throughaxially-extending slots in the barrel ,to connect the clutch mechanismto the platen.

l0. In a typewriting machine, the combination with a line-space wheeland a platenand axle rotatable relatively thereto,

of aclutch mechanism to connect the platen and axle to the line-spacewheel, a slotted hollow plunger supported on the axle and controllingthe clutch mechanism, a finger knob, having a hub through which theplunger extends, and a set screw passing. through the slot in theplunger to connect the finger knob to the axle and spline theplungerthereto.

11. In a typewriting machine, the combination with a platen, a platenaxle and a line space wheel, of areleasable means for connecting theline space wheel tothe platen a finger piece to operate said releasingmeans, said finger piece having a hollow stem whereby it is mounted onsaid axle, a finger knob through which said hollow stem extends, saidhollow stem. provided with a longitudinal slot, and means passingthrough said slot to connect said finger knob to said axle.

12. In a typewriting machine, the combination with a platen, a platenaxle and a line space wheel; of a releasable means for connecting theline space wheel to the platen, a finger piece to operate. saidreleasing means, said finger piece having a hollow stem whereby it ismounted on said axle, a finger knob through which said hollow stemextends, said stem having between its ends a cutaway portion, andconnecting means between said axle and said finger knob at said cutawayportlon.

13. In a typewritin-g machine, the comwith opposite longitudinal slots,and set 10 bination with a platen, a platen axle and a screws or devicespassing through said slots line space wheel, of a releasable means forto fasten said finger knob to said axle; the; connecting the line spacewheel to the platen, latter having a groove or depression to re '5 afinger piece to operate said releasing ceivethe points of the setscrews.

means, said finger piece having a hollow I stem whereby it is mounted onsaid axle, a Witnesses: finger knob-through which said hollow stern K.FRANKFORT, extends, and the said'hollow stem provided ;C. RIPLEYQ FRANK-A. YOUNG.

Gopies of this patent may be obtained for five cents. each, byaddressing the Commissioneroflathts, I I v Was'hingtonD. .G.

